Doc: Describe "Get Qt" option in Welcome mode

Update screenshot.

Change-Id: Ia209ba65a27f213c3248d4d2535eac6cebd03774
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

doc/qtcreator/src/howto/creator-ui.qdoc

@@ -56,6 +56,7 @@
         \if defined(qtcreator)
         \li Browse Qt extensions in the \l{https://marketplace.qt.io/}
             {Qt Marketplace}
+        \li Download the Qt Installer
         \endif
 
         \li Read news from the online community and Qt blogs

doc/qtcreator/src/mcu/creator-mcu-dev.qdoc

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2019 The Qt Company Ltd.
+** Copyright (C) 2020 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Creator documentation.
@@ -76,8 +76,8 @@
     \section2 MCU Plugin
 
     To be able to develop applications for MCUs, you need the MCU plugin.
-    This plugin is enabled automatically by the Qt online installer when
+    This plugin is enabled automatically by the Qt Installer when you
-    you install the Qt for MCUs SDK.
+    install Qt for MCUs.
 
     \section2 Specifying MCU Settings
 

doc/qtcreator/src/overview/creator-only/creator-configuring.qdoc

@@ -56,15 +56,16 @@
     \section1 Checking Build and Run Settings
 
     \QC is an integrated development environment (IDE) that you can use to
-    develop Qt applications. While Qt installers typically install \QC,
+    develop Qt applications. While you can use the Qt Installer to install \QC,
-    stand-alone \QC installers never install Qt or any Qt tools, such as qmake.
+    the stand-alone \QC installer never installs Qt or any Qt tools, such as
-    To use \QC for Qt development, you also need to have a Qt version and a
+    qmake. To use \QC for Qt development, you also need to have a Qt version
-    compiler installed.
+    and a compiler installed. If you update the compiler version later, you
+    can register it into \QC.
 
-    Qt installers, such as SDKs, often attempt to auto-detect the installed
+    The Qt Installer attempts to auto-detect the installed compilers and Qt
-    compilers and Qt versions. If they succeed, the relevant kits will
+    versions. If it succeeds, the relevant kits will automatically become
-    automatically become available in \QC. If they do not, you must add the kits
+    available in \QC. If it does not, you must add the kits yourself to tell
-    yourself to tell \QC where everything is.
+    \QC where everything is.
 
     To add kits, select \uicontrol Tools > \uicontrol Options >
     \uicontrol Kits > \uicontrol Add.

doc/qtcreator/src/projects/creator-only/creator-projects-compilers.qdoc

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2019 The Qt Company Ltd.
+** Copyright (C) 2020 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Creator documentation.
@@ -42,9 +42,9 @@
     specifies the compiler and other necessary tools for building an application
     for and running it on a particular platform.
 
-    \QC automatically detects the compilers that are registered by your system
+    \QC automatically detects the compilers that are registered by your
-    or by an installer and lists them in \uicontrol Tools > \uicontrol Options >
+    system or by the Qt Installer and lists them in \uicontrol Tools >
-    \uicontrol Kits > \uicontrol Compilers:
+    \uicontrol Options > \uicontrol Kits > \uicontrol Compilers:
 
     \image qtcreator-toolchains.png
 
@@ -59,8 +59,8 @@
 
         \li \MinGW (Minimalist GNU for Windows) is a native software port of GCC
             and GNU Binutils for use in the development of native Microsoft
-            Windows applications on Windows. \MinGW is
+            Windows applications on Windows. \MinGW is distributed together with
-            distributed together with \QC and Qt installers for Windows.
+            \QC and Qt for Windows.
 
         \li ICC (Intel C++ Compiler) is a group of C and C++ compilers.
             Only the GCC-compatible variant, available for Linux and \macos,

doc/qtcreator/src/projects/creator-only/creator-projects-qt-versions.qdoc

@@ -43,8 +43,8 @@
 
     \section1 Registering Installed Qt Versions
 
-    \QC automatically detects the Qt versions that are registered by
+    \QC automatically detects the Qt versions that are registered by your
-    your system or by installers. To view detailed information for each Qt
+    system or by the Qt Installer. To view detailed information for each Qt
     version, select it in the list and select \uicontrol Details in the
     \uicontrol {Qt version for} section.
 
@@ -137,7 +137,7 @@
     output exist. When \QC complains about the installation of a self-built Qt
     version, try running \c {make install} in the build directory to actually
     install Qt into the configured location. If you installed Qt using the Qt
-    installer, run the Qt maintenance tool to check for updates or to reinstall
+    Installer, run the Qt maintenance tool to check for updates or to reinstall
     the Qt version.
 
     \section1 Minimum Requirements

doc/qtcreator/src/webassembly/creator-webassembly.qdoc

@@ -65,8 +65,8 @@
     \section1 Setting Up the Development Environment
 
     You need to install and configure Qt for WebAssembly and the tool chain for
-    compiling to WebAssembly. The installer automatically adds a build and run
+    compiling to WebAssembly. The Qt Installer automatically adds a build and
-    kit to \QC.
+    run kit to \QC.
 
     \section2 Setting Up Qt for WebAssembly
 

doc/qtdesignstudio/src/qtbridge/qtbridge-overview.qdoc

@@ -37,10 +37,10 @@
     the 3D graphics tools to save the assets in widely-used 3D graphics formats,
     and then use \QB to import them into \QDS.
 
-    You can use the Qt online installer to install \QB if you have a commercial
+    You can use the Qt Installer to install \QB if you have a commercial
     \QDS license. You can also purchase a \QB license separately from the
     \l{https://marketplace.qt.io/}{Qt Marketplace} and then install \QB using
-    the Qt online installer.
+    the Qt Installer.
 
     For best results when importing assets, follow
     the guidelines for creating and exporting them.

doc/qtdesignstudio/src/qtbridge/qtbridge-ps-setup.qdoc

@@ -31,7 +31,7 @@
     \title Setting Up \QBPS
 
     You can purchase a \QBPS license from the \l{https://marketplace.qt.io/}
-    {Qt Marketplace}, and then use the Qt online installer to have the \QBPS
+    {Qt Marketplace}, and then use the Qt Installer to have the \QBPS
     installation package copied to the following path in your Qt installation
     folder: \c {QtDesignStudio\photoshop_bridge}.
 

doc/qtdesignstudio/src/qtbridge/qtbridge-sketch-setup.qdoc

@@ -31,7 +31,7 @@
     \title Setting Up \QBSK
 
     You can purchase a \QBSK license from the \l{https://marketplace.qt.io/}
-    {Qt Marketplace}, and then use the Qt online installer to have the \QBSK
+    {Qt Marketplace}, and then use the Qt Installer to have the \QBSK
     plugin package copied to the following path in your Qt installation
     folder: \c {QtDesignStudio\sketch_bridge\io.qt.qtbridge.sketchplugin}.